Cooxidation process for the production of dimethyl terephthalate

Details Cooxidation process for the production of dimethyl terephthalate Cooxidation process for the production of dimethyl terephthalate

1973-10-04

1976-05-11

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260524R, C07C 6982

Patent

active

039563626

ABSTRACT:
Disclosed is an improvement in the cooxidation process for making dimethyl terphthalate (DMT). In the cooxidation process an oxidate comprising monomethyl terephthalate and p-toluic acid is esterified with methanol to form a reaction mixture comprising DMT and methyl p-toluate, methyl p-toluate is separated from the reaction mixture, and p-xylene and said methyl p-toluate are cooxidized in the liquid phase with molecular oxygen to form more oxidate, which is esterified, etc. The improvement comprises separating p-toluic acid from part of the oxidate prior to esterifying the oxidate, and cooxidizing separated p-toluic acid with said p-xylene and said methyl p-toluate. This improvement results in a lesser quantity of oxidate subjected to esterification, and a reduction in the quantity of methyl p-toluate cooxidized with p-xylene.

REFERENCES:
patent: 2894978 (1959-07-01), Katzschmann

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